Of same place



(No Model.)

G. H. DIMOND 8v W. F. DIAL.

, PIIIGTION DRIVING PULLBY FOR SEWING MACHINES. y

No. 588,963. Patented Aug. 31,1897.

UNITED STATESV PATENT Orricn.

GEORGE H. DIMOND AND VILBUR E. DIAL, OF BRIDGEPORT,CONNECTICUT, ASSIGNORS TO THE VHEELER it WILSON MANUFACTURING COMPANY;

OF SAME PLACE.

FRlcTloN DRIVING-PULZLEY* FOR SEWING-MACHINES.

SPECIFICATION forming m of Lettersratent No. 588,968, dated August e1, 1897.

Application filed February 2, 189i?,A 'Serial No. 62l,6v79.' (No model.) I

To a/ZZ whom it' may concern-E Beit known that we, GEORGE H. DIMoND and VVILBUR F. DIAL, of Bridgeport, in the county of Fairfield and State of Connecticut,

5 have invented an Improvementfin Friction.

other part is free to be rotated continuously,

the continuously-rotating parts being adapted at desired times to engage frictionally and rotate with it the part of said pulley fixed to 2o said main shaft, and consequently rotate the main shaft.

Our invention is intended as an improvement on the apparatus shown in United States Patent No. 391,694, dated October 23, 1888.

In this our present invention, to enable the shaft and the pulley to be rotated with they minimum of friction, we have provided the friction-pulley with thrust-bearings containing antifriction-rolls, one of said thrust-bearings being connected with the hubof the fast pulley, so as to be interposed between it and the head -of the machine, while the other of said thrust-bearings is placed at the outer end of the continuously-moving part of said between the smaller rclls of said thrust-'bear-l ing, and a pressure-lever by the movement of which the said pulley parts are forced firmly in contact, so that the continuously-moving 4o driving-pulley will take and move with it the fast pulley and its shaft or will leave the said fast pulley and its shaft at rest, a brake connected with or forming part ofsaid pressurelever and controlled by the foot of the oper- V ator in usual manner being employed to engagethe peripheries of and stop the rotation of the said fast pulley whenever the continuously-moving pulley is free from pressure against it.

5o Sewing-machines have not heretofore come the hub of the pulley and the head of the magenerally into use wherein the main shaft carries a friction clutch-pulley, for the reason that the pressure required to force and hold the pulley parts in contact when the continuously-moving part is made operative to rotate the main shaft is so excessive as to add not only severely to the labor of the operator, but also to put such an amount of drag on the machine owing to the in thrust as to require a greatly-increased amount of power to run the machine, but by the interposition of the antifriction thrust-bearings, such as herein provided for, it becomes possible to put the friction clutch-pulley on the main shaft or head of the machine, where it may be easily controlled by the operator Aand without undue loss of power.

The antifriction thrust-bearing interposed between the fast pulley and the head of the machine has a loose sleeve provided with a flange','on one side of which the said rolls run, the said sleeve being extended from the said pulley into an annular chamber or recess in the machine -head lsurrounding the main shaft, said chamber receiving said sleeve when the fast pulley is secured to the main shaft, the said sleeve being of such length with relation to the depth of said chamber that itwill bottom in the said chamber before 8o chine come in contact, and consequently said `sleevestands stationary and affords an annular support, upon which the rolls in said fast Vpulley run. 35 pulley, a large roll or ball being interposed `By employing a large ball between thebev. 8 5

eled end of the swinging pressure-lever and the thrust-bearing in the outer end of the continuously-rotating pulley it is possible to always insure a right-line pressure on the said continuously-moving pulley when it is being pushed frictionally against the saidfast pulley, said roller preventing any side-thrust or vpressure on the said pulley as the said pressure-lever is coming into operation.

Figure l represents a sufficient portion of 95 the rear end of a sewing-machine withour improvements added tov enable our invention to be understood. Fig. 2 is a partial section in the line Fig. l; and Fig. 3 is a detail of one of the thrust-b earings detached.

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The bed-plate A and uprightarnrA, erected thereon, and the main shaft A2 of the machi ne, partially shown in Fig. 2, and the pressurelever C, having an inclined face at c and having connected to it a link D under the control of the foot of the operator, are and may be all substantially as shown in said patent.

The fast-pulley part B of the friction driving-pulley has a friction-face B' and an extended sleeve-hub B2, and this pulley is made fast upon the main shaft by suitable setscrews, as l).

The upright portion A of the sewing-machine, it constituting part of the head, has formed in it about the shaft A2 a recess, (shown at a, Fig. 2,) and the inner face of the fast pulley B is chambered to receive an antifriction thrust-bearing, composed, essentially, of the cage a', containing a series of rolls 0:2, the said cage being forced snugly into the said recess. Inside of this cage and surrounding the main shaft we have introduced a sleeve a3, it having a flange within the cage which acts against the rolls a2, and to retain this sleeve in place we have forced inside the cage and between it and the shank of the sleeve a ring ai. The sleeve extends from the inner side of the fast pulley and enters the recess a in the head, it bottoming in said recess just before the ring a4 touches the head or upright A', said sleeve by its contact with the head being retained from rotation, but the fast pulley, also fixed to the shaft A2, rotates freely, and the rolls turn 011 the fiange of the sleeve. The fast pulley is further secured upon the main shaft by meansof a setscrew d, inserted into the extended hub B2 of the pulley and entering a tapped hole in the end of the shaft.

The continuously-rotating pulley E of the friction driving-pulley has a friction-face e, which when thrust against the face B of the fast pulley rotates it with it, but when released enables'the said pulley part E to be rotated and leave the main shaft and fast pulley at rest. The pulley part E runs loosely on the extension B2 of the fast pulley, and at its outer end the said pulley is suitably chambered to receive a tip e', the said tip being circular and open at its end. This tip contains a large roll or ball e2, which rests against a series of small rolls e2, held by a cage et, forced into the tip, as best shown in Fig. 2.

Fig. 2 shows the pulley part E out of contact with the fast pulley, the latter rotating freely.

Now to cause the main shaft to be rotated the operator will, through his foot 01 otherwise, turn the pressure-lever C in the direction indicated by the arrow in Fig. 2, and the inclined face c, acting on the large ball e2, will rotate it in contact, however, with the series of smaller rolls in the antifriction thrust-bearing part E and will force the said pulley part laterally upon the extension B2 and force the leather or other material c closely against the fast pulley and rotate it with it. The rotation of the large ball e2 prevents any side strain on the pulley E.

Prior to our invention we are not aware that a fast and a loose pulley employed together have ever both and each been provided with antifriction thrust-bearings.

We do not claim simply a ball-bearing composed of one large ball in contact with a scries of small balls, as this is old.

Having fully described our invention, what we elai1n, and desire to secure by Letters Patent, is-

l. The main shaft and its attached fast pulley provided with an antifriction thrustbearing interposed between said pulley and the bearing for the said shaft, combined with a pulley E adapted to be rotated continuously coincident with the said fast pulley and provided at its end with an antifriction thrustbearing, a pressure-lever, and means between said pressure-lever and the thrust-bearing of the pulley E to effect a longitudinal rightline movement of the pulley E frictionally against the said fast pulley and axially of said main shaft, substantially as described.

2. The main shaft A2, the fast pulley fixed thereto, and having an antifriction thrustbearing interposed between one of its sides, and the bearing for the said main shaft, and a loose pulley adapted to be continuously rotated and provided at its outer side with an antifriction thrust-bearin g, combined with a large ball supported by the balls of the thrustbearing in the said loose pulley, a tip fixed on said loose pulley and embracing said thrust-bearing and also said large ball, and a pressure-lever acting upon said large ball, thereby to move said loose pulley into` engagement with said fixed pulley, substantially as described.

3. The main shaft A2, and its bearings, the latter having an annular chamber a at one end, and a sleeve fitted within said chamber, said sleeve having an outturned flange eX- tending beyond said chamber, combined with a fast pulley secured to said shaft adjacent said end, and having an antifriction thrustbearing to cooperate with said sleeve, said thrust-bearin g comprising a plurality of balls between said pulley and said sleeve, and a cage secured to said pulley, inclosing said balls and overlapping said flange, substantially as described.

4. The main shaft, and its bearings, a fast pulley secured to said shaft, a loose pulley adjacent said fast pulley, a pressure-lever to move said loose pulley bodily to engage said fast pulley and drive said shaft, and an antif riction thrust-bearing comprising a plurality of small balls mounted on and carried by said loose pulley, said thrust-bearing having a large ball supported by said small balls axially of said pulleys and between said thrustbearing and said lever, whereby the latter effects a right-line movement of the loose pulley longitudinally of said shaft, substantially as described.

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5. The .main shaft, and its bearings, the latter having an annular chamber at one end', and a sleeve fitted Within said chamber, said sleeve having an outturned flangeextending beyond said chamber, combined with a fast pulley secured to said shaft adjacent said end, and having an antifriction thrust-bearing tocoperate with said sleeve, said thrustbearing comprising a plurality of balls between said pulley and said sleeve, and a cage inclosing said balls and overlapping said liange, substantially as described.

6. The main shaft, and its bearings, conibined with a fast pulley on said shaft adjacent said bearings, an antifriction thrustbearing, comprising a plurality of balls, between said pulley and said bearings, a sleeve between the latter and said balls, said sleeve having an outturned flange adjacent said balls, a cage inclosing said balls-and over- GEORGE H. DIMOND. WILBUR F. DIAL.

Witnesses: v

ISAAC HOLDEN, GEO, CORNWELL. 

